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The 29-year-old, who has played for Brazil and Spain at international level, revealed he waited "a long time" to rejoin the Spanish giants.

Speaking at his unveiling on Sunday he said: 'I thank the club for the effort they’ve made to bring me back. I thank them from the bottom of my heart. My fitness? You can see I’m looking much better now. I’ve prepared well for this and I’m looking forward to playing and helping the team.

'I’ve waited a long time for this. Now I have my mind set on playing. As much as I’ve trained, it’s not like playing a match and I’m tired of training so much.

Costa also admitted he 'suffered' not playing for Chelsea this term after being frozen out

'Three months out? You suffer more when you’re not playing. I see the team in a good way.'

Costa insisted Atleti could still challenge for honours despite being eliminated from the Champions League after finishing third in Group C.

He also admitted he failed to learn English during his time at Chelsea but insists he only has good memories of the club.

He added: 'The truth is that I felt very good there. The people there helped me a lot and made my life easy. They’re a great club and I only have good memories of my time with them.'